JP2001227362A - Throttle control device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a positioning mechanism of a throttle shaft by setting the both faces of an opener to abutment faces for a thrust stopper. SOLUTION: The opener 22 is rotatably and slidably fitted to the throttle shaft 18 and a back spring 33 and a release spring 34 are arranged inside and outside the opener 22 respectively. A throttle gear 23 is fitted and fixed to the throttle shaft 18 and the opener 22 is moved inward or outward according to the rotation angle of the throttle gear 23 in driving an internal combustion engine. The inside face of the opener 22 abuts on a throttle body 10 so as to stop the inward movement of the opener 22 while the outside face of the opener 22 abuts on the inside face of the throttle gear 23 so as to stop the outward movement of the opener 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throttle control device for controlling an intake air amount of an internal combustion engine.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open Publication No. Hei.
The thing described in 271528 gazette is known. In this prior art, an opener lever (relief lever) for fixing the throttle valve to a predetermined position when the engine is stopped is rotatably supported on the throttle shaft, and a back spring is mounted between the opener lever and the throttle body main body. , A relief spring is mounted between the opener lever and the throttle lever. The relief spring urges the throttle valve fully open,
The back spring biases the throttle valve in the fully closed direction. The throttle valve has a fully open position F, a fully closed position (minimum open position) S, and an opener open position N therebetween.

If the throttle valve is always in the fully closed position when the engine is stopped, the throttle shaft and the throttle valve may freeze at a low temperature, for example, in a cold region, and the engine may start poorly. To cope with such a problem, there is an opener opening position N for maintaining the throttle valve at a position opened by a predetermined amount from the fully closed position when the engine is stopped. In this prior art, when the contact piece of the opener lever contacts the opener stopper, the throttle valve is maintained at the opener opening position N, and when the contact piece of the throttle lever contacts the fully closed stopper,
The fully closed position S is reached. The fully open position F is a position in which the rotational force of the control motor in the fully open direction acts on the back spring via the throttle lever, and the urging force of the back spring and the rotational force of the control motor are balanced.

In this prior art, since two stoppers are required for positioning the throttle valve, there are disadvantages in that the number of parts is large, and labor and cost for parts and assembly are required. In addition, since a chamber accommodating the opener or the like in one of the throttle shafts and a gear chamber accommodating the reduction gear mechanism connected to the control motor are formed separately, the efficiency is poor, and the opener or the like is provided in one chamber. There is a demand to accommodate a reduction gear mechanism and the like.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a throttle control device for an internal combustion engine, in which an opener and a reduction gear mechanism are housed in the same chamber, and both sides of the opener are used as abutting surfaces of a thrust stopper. The first problem is to simplify the air conditioner, and the open position of the back spring for urging the throttle valve in the closing direction and the relief spring for urging the throttle valve in the opening direction are the opener position N. The second problem is to form the contact surfaces of the thrust stoppers on both sides of the opener at a portion with a small radius to reduce the sliding resistance.

[0006]

According to the present invention, an opening degree of a throttle valve in an intake passage is controlled by a control motor.
The rotation of the control motor is transmitted to the throttle valve via the reduction gear mechanism, and the opener is rotatably and slidably fitted to the throttle shaft, and the back spring is disposed inside the opener and the relief spring is disposed outside the opener. In a throttle control device for an internal combustion engine, wherein the back spring biases the throttle valve in the closing direction and the relief spring biases the throttle valve in the opening direction, the throttle gear is fixedly fitted to the throttle shaft. During operation of the engine, the opener is moved inward or outward according to the rotation angle of the throttle gear, and the inner surface of the opener comes into contact with the throttle body main body, so that the inward movement of the opener is stopped, and the outer surface of the opener is moved. By contacting the inner surface of the throttle gear, The first configuration that outward movement of the burner is stopped. Here, the biasing force of the relief spring is set to be larger than the biasing force of the back spring,
The biasing force of the relief spring and the back spring can be made smaller than the drive torque of the control motor.
According to the present invention, in the first configuration, when the internal combustion engine is stopped, the back spring biases the throttle valve in the closing direction,
At the same time, the relief valve urges the throttle valve in the opening direction, and the throttle valve is maintained at the opener opening position N which is opened by a predetermined amount from the fully closed position. According to the present invention, in the first and second configurations, the inward movement of the opener is stopped when the distal end surface of the first cylindrical portion of the throttle body abuts on the inner flat surface of the opener, and the opener moves outward. The third configuration is that the stop is performed when the outer end surface of the boss of the opener abuts on the small-diameter flat surface of the throttle gear. The present invention provides first to third
In the configuration, the inner end of the back spring is engaged with the spring insertion hole of the throttle body, the outer end of the back spring is engaged with the inner spring groove of the opener, and the inner end of the relief spring is connected to the outer spring of the opener. The fourth configuration is such that the outer end of the relief spring is engaged with the inner peripheral wall of the large-diameter flat surface of the throttle gear.

[0007]

1 and 2 show an embodiment of a throttle control device for an internal combustion engine according to the present invention. 1 and 2, an intake passage 11 is formed in the center of the throttle body main body 10, and two insertion holes and a first cylindrical portion 12 (in FIG. Intake passage 11
1) and a second cylindrical portion 13 (the left side of the intake passage 11 in FIG. 1). A bearing (ball bearing) 15 and a retaining ring 16 are mounted radially inside the first cylindrical portion 12, and a bearing (needle bearing) 17 is mounted radially inside the second cylindrical portion 13. The part 13 is sealed with a plug 14. The throttle shaft 18 inserted into the insertion hole,
A throttle valve 19 rotatably supported by bearings 15 and 17 and engaged with a throttle shaft 18 is fixed by bolts. At the tip end (right end in FIG. 1) of the throttle shaft 18, a medium diameter portion and a small diameter portion 18 are located adjacent to the large diameter portion.
A is formed, and a substantially disk-shaped opener 22 is fitted to the tip of the large diameter portion of the throttle shaft 18 so as to be rotatable and slidable. A throttle gear 23 is fitted to the middle diameter portion of the throttle shaft 18 so as not to rotate with each other, and the throttle gear 23 is fixed by screwing a nut.

An annular inner spring groove 24 is formed in the vicinity of the outer peripheral portion inside the opener 22 (the left side in FIG. 1).
Back spring 33 on the bottom outer peripheral wall (large-diameter cylindrical part 59) of 24
Outside engagement hole 29 is formed. An annular outer spring groove 25 is formed outside (in the radial direction inside the inner spring groove 24) radially outside the opener 22 (right side in FIG. 1), and the bottom inner peripheral wall (small-diameter cylindrical portion) of the outer spring groove 25 is formed. 60), an inner engaging hole 30 for the relief spring 34 is formed. An annular spring insertion groove 26 is formed in the throttle body body 10 at a position radially outward of the first cylindrical portion 12 and opposed to the inner spring groove 24, and a back spring is formed on a bottom outer peripheral wall of the spring insertion groove 26.
An inner engaging hole 28 for 33 is formed. Throttle gear
Inside the opener 23, an annular large-diameter flat surface 52 is formed at a position generally facing the outer spring groove 25 of the opener 22, and the large-diameter flat surface 52 is formed.
The inner peripheral wall is adjacent to the inner side in the radial direction of the
An outer engaging hole 31 for a relief spring 34 is formed in the inner peripheral wall of the inner peripheral wall.

The back spring 33 and the relief spring 34 have a function of a torsion coil spring, and the ends thereof extend outward or inward in the radial direction by a predetermined length. Here, the urging force of the relief spring 34 is set to be larger than the urging force of the back spring 33, and the urging forces of the relief spring 34 and the back spring 33 are made smaller than the driving torque of the control motor 36. The back spring is inserted into the spring insertion groove 26 of the throttle body 10 and the inner spring groove 24 of the opener 22.
33 is inserted, the inner end of the back spring 33 bent outward in the radial direction is engaged with the inner engaging hole 28, and the outer end of the back spring 33 bent outward in the radial direction is connected to the outer engaging hole 29. Is engaged. Similarly, a relief spring 34 is arranged between the outer spring groove 25 of the opener 22 and the large-diameter flat surface 52 of the throttle gear 23, and the inner end of the relief spring 34 bent radially outward has an inner engagement hole. The outer end of the relief spring 34 that is engaged with 30 and bent inward in the radial direction is engaged with the outer engagement hole 31.

The back spring 33 is provided with the throttle valve 19
In the closing direction (right-handed screw direction when viewed from the right in FIGS. 1 and 2), and the relief spring 34 urges the throttle valve 19 in the opening direction. Due to the rotation of the throttle gear 23, the back spring 33 and the relief spring 34 are entrained and unwound, so that the total length of the back spring 33 and the relief spring 34 changes, and the opener 22 is moved inward and outward (left and right in FIGS. 1 and 2). Direction). Here, when the throttle gear 23 is rotated in the closing direction of the throttle valve 19, the relief spring 34 expands, the back spring 33 contracts, and the opener 22 moves inward (to the left in FIGS. 1 and 2).
When the throttle gear 23 is rotated in the opening direction of the throttle valve 19, the relief spring 34 contracts and the back spring
33 is extended and the opener 22 moves outward (to the right in FIGS. 1 and 2). When the torsional directions of the back spring 33 and the relief spring 34 are reversed, the moving direction of the entire length is reversed.

The distal end surface of the first cylindrical portion 12 of the throttle body main body 10 and the inner flat surface 53 of the opener 22 face each other.
The distance between the distal end surface of the first cylindrical portion 12 and the inner flat surface 53 of the opener 22 is A. Similarly, throttle body body 10
The outer stepped surface 56 and the inner end surface of the large-diameter cylindrical portion 59 inside the opener 22 face each other, and the outer stepped surface 56 and the inner end surface of the large-diameter cylindrical portion 59 inside the opener 22 are opposed to each other. Let B be the distance between them. The distance of the gap is A <B, and the first cylindrical portion 12
The contact surface between the front end surface of the throttle body and the inner flat surface 53 of the opener 22 is located radially inward of the outer stepped surface 56 of the throttle body 10 and the inner end surface of the large-diameter cylindrical portion 59 inside the opener 22. positioned. When the opener 22 moves inward, the distal end surface of the first cylindrical portion 12 and the inner flat surface 53 of the opener 22 come into contact with each other,
The inward movement of the opener 22 stops.

The outer end surface of the boss 61 of the opener 22 and the small-diameter flat surface 51 of the throttle gear 23 face each other.
Outside surface of the boss 61 and the small-diameter flat surface 51 of the throttle gear 23
Is C. Similarly, the annular medium-diameter protrusion 62 on the outer surface of the opener 22 and the large-diameter flat surface 52 of the throttle gear 23 face each other, and the medium-diameter protrusion 62 of the opener 22 and the large-diameter flat Let D be the distance between the surface 52. The distance of the gap is C <D, and the contact surface between the outer end surface of the boss 61 of the opener 22 and the small-diameter flat surface 51 of the throttle gear 23 is formed by the medium-diameter protrusion 62 of the opener 22 and the throttle gear 23. Are located radially inward of the large-diameter flat surface 52. When the opener 22 moves outward, the opener
Outer end surface of boss 61 of 22 and flat surface of small diameter of throttle gear 23
51 abuts and the opener 22 stops moving outward.

A control motor 36 is mounted on the throttle body 10 in parallel with the axis of the throttle shaft 18, and a drive gear 37 is fixed to the tip of the output rotation shaft of the control motor 36. A counter gear 38 is provided at a position between the drive gear 37 and the throttle gear 23, and a support shaft 39 rotatably inserted into the center hole of the counter gear 38 has an inner end (the left end in FIG. 1). ) Is press-fitted and fixed in a support hole of the throttle body body 10, and an outer end (right end in FIG. 1) is mounted in a support hole of a gear cover 40 described later. The drive gear 37 meshes with a large-diameter gear of the counter gear 38, and a small-diameter gear of the counter gear 38 meshes with the throttle gear 23. Each gear
The gear cover 40 covers 23, 38, 37, the opener 22, the springs 33, 34, and the like, and the open end 41 of the gear cover 40 abuts and is fixed to the open end 42 of the throttle body 10. A water pool groove 43 is formed at the open end 41 of the gear cover 40.

The small diameter portion 18A of the throttle shaft 18 projects outward from the insertion hole of the gear cover 40, and the space between the gear cover 40 and the small diameter portion 18A is sealed by a dust seal.
A sensor lever 44 is provided on the small diameter portion 18A of the throttle shaft 18.
Are fitted and fixed, and the conductive elastic brush 45 is fixed to the sensor lever 44. Brush 45 is a sensor lever
It is arranged outside (outside the right side in FIG. 1) of 44. A sensor substrate 46 is assembled at a position facing the brush 45, and four resistors (not shown) are embedded in the sensor substrate 46. The resistor has an arc shape corresponding to the rotation locus of the brush 45, and the tips of the four brushes 45 constantly press and contact each resistor.

A gear cover 40 is provided inside the outer peripheral portion of the sensor substrate 46.
The outer periphery of the sensor substrate 46 is contacted with an elastic packing 47 and a sensor cover 48 in order, and the sensor cover 48 is fixed by deformation to the inside of the open end of the gear cover 40. ing. Brush 45 and sensor substrate 46
The sensor unit including the gear cover 40 and the sensor cover 48
Are housed in a sensor room 49 formed between the sensor room 49 and the gear train room by the sensor room wall 50 of the gear cover 40.
21 and are isolated.

The operation of the embodiment of the present invention will be described. When the electric signal to the control motor 36 is stopped (when the operation is stopped), the back spring 33 urges the throttle valve 19 in the closing direction, and at the same time, the relief spring 34 urges the throttle valve 19 in the opening direction. As a result, the throttle valve 19 is maintained at the opener opening position N which is opened by a predetermined amount from the fully closed position. The engine is in a start waiting state at the opener position N. By maintaining the opener opening position N, it is possible to prevent the throttle valve and the throttle shaft from freezing in a cold region or the like, and to prevent the engine from starting poorly.

When the engine is started at the opener opening position N and the engine is idling, the control motor 36
The signal of the throttle valve 19 fully closed position (minimum opening position, idling position) S is transmitted to the control valve 36, and the control motor 36 rotates to the fully closed position. The throttle gear 23 rotates to the fully closed position against the urging force of the relief spring 34, the opener 22 moves outward, and the outer end surface of the boss 61 of the opener 22 and the small-diameter flat surface 51 of the throttle gear 23 contact each other. Then, the outward movement of the opener 22 stops. The contact surface between the outer end surface of the boss 61 of the opener 22 and the small-diameter flat surface 51 of the throttle gear 23 is radially inward of the medium-diameter projection 61 of the opener 22 and the large-diameter flat surface 52 of the throttle gear 23. , The sliding resistance is reduced.

When the accelerator pedal is depressed, the ECU
A signal for opening the throttle valve 19 is transmitted from the controller to the control motor 36, and the control motor 36 moves in the opening direction (throttle range) according to the signal. The throttle gear 23 rotates in the opening direction against the urging force of the back spring 33, and the opener 22 moves inward. When the accelerator pedal is further depressed and the control motor 36 moves to the fully opened position, the throttle gear 23 rotates to the fully opened position, the opener 22 moves further inward, and the distal end face of the first cylindrical portion 12 and the inside of the opener 22 are opened. The flat surface 53 abuts, and the inward movement of the opener 22 stops. The contact surface between the distal end surface of the first cylindrical portion 12 and the inner flat surface 53 of the opener 22 is smaller than the outer stepped surface 56 of the throttle body 10 and the inner end surface of the large-diameter cylindrical portion 59 inside the opener 22. Since it is located radially inward, sliding resistance is reduced.

[0019]

According to the first aspect, the throttle gear is fitted and fixed to the throttle shaft, and when the internal combustion engine is operating, the opener is moved inward or outward according to the rotation angle of the throttle gear. When the inner surface of the opener contacts the throttle body, the inward movement of the opener is stopped, and when the outer surface of the opener contacts the inner surface of the throttle gear, the outer movement of the opener is stopped. Therefore, the opener and the reduction gear mechanism are housed in the same chamber, and the opening mechanism is simplified by using both sides of the opener as abutting surfaces of the thrust stopper, thereby reducing the number of parts and the number of assembling steps, thereby reducing costs. Can be reduced. According to a second aspect of the present invention, in addition to the configuration of the first aspect, when the internal combustion engine is stopped, the back spring biases the throttle valve in the closing direction, and at the same time, the relief spring biases the throttle valve in the opening direction. The valve is maintained at the opener opening position N which is opened by a predetermined amount from the fully closed position. Therefore, in addition to the effect of the first aspect, the position where the back spring for urging the throttle valve in the closing direction and the relief spring for urging the throttle valve in the opening direction can be set as the opener opening position N. . According to the third aspect of the present invention, the inward movement of the opener is stopped when the distal end surface of the first cylindrical portion of the throttle body abuts on the inner flat surface of the opener, and the outward movement of the opener is caused by the boss of the opener. When the outer end surface of the throttle gear comes into contact with the small-diameter flat surface of the throttle gear, the motor stops. As described above, the contact surfaces of the thrust stoppers on both sides of the opener are formed at the portion having the smallest radius, and the sliding resistance is reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a throttle control device for an internal combustion engine of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

[Explanation of symbols]

 10: Throttle body 11: Intake passage 12: First cylinder 18: Throttle shaft 19: Throttle valve 22: Opener 23: Throttle gear 33: Back spring 34: Relief spring 36: Control motor 51: Small diameter flat surface 53: Inside Flat surface 61: Boss

Continued on the front page (72) Inventor Takashi Tsuge 1-1-1 Kyowa-cho, Obu-shi, Aichi F-term (reference) in Ai San Kogyo Co., Ltd. 3G065 CA23 DA05 DA06 DA15 GA46 HA12 HA15 HA21 HA22 KA15 KA16

Claims (4)

[Claims] An opening degree of a throttle valve in an intake passage is controlled by a control motor, and rotation of the control motor is transmitted to a throttle valve via a reduction gear mechanism, and an opener is rotatably and slidably fitted to a throttle shaft. And
A back spring is arranged inside the opener, and a relief spring is arranged outside the opener. The back spring urges the throttle valve in the closing direction and the relief spring urges the throttle valve in the opening direction. In the control device,
The throttle gear is fitted and fixed to the throttle shaft, and during operation of the internal combustion engine, the opener is moved inward or outward according to the rotation angle of the throttle gear, and the inner surface of the opener abuts on the throttle body main body. A throttle control device for an internal combustion engine, wherein the inward movement of the opener is stopped, and the outer movement of the opener is stopped by the outer surface of the opener abutting on the inner surface of the throttle gear. 2. When the internal combustion engine is stopped, the back spring urges the throttle valve in the closing direction, and at the same time, the relief valve urges the throttle valve in the opening direction, and the throttle valve opens a predetermined amount from the fully closed position. 2. The throttle control device for an internal combustion engine according to claim 1, wherein the throttle control device is maintained at the opener position N. 3. The inward movement of the opener is stopped when the distal end surface of the first cylindrical portion of the throttle body abuts on the inner flat surface of the opener.
3. The throttle control device for an internal combustion engine according to claim 1, wherein the stop is performed when the outer end surface of the boss of the opener abuts on the small-diameter flat surface of the throttle gear. 4. An inner end of the back spring is engaged with a spring insertion hole of the throttle body, an outer end of the back spring is engaged with an inner spring groove of the opener, and an inner end of the relief spring is formed of the opener. 4. The throttle spring is engaged with the outer spring groove, and the outer end of the relief spring is engaged with the inner peripheral wall of the large-diameter flat surface of the throttle gear.
A throttle control device for an internal combustion engine described in any one of the above.